It likewise doesn't make any difference whether the duty is exacted as a level of the cost [say promotion valorem charge] or as a proper aggregate for each unit (say explicit assessment]. Both are graphically communicated as a shift of the interest bend to one side. While the interest bend moved by explicit duty is corresponding to the underlying, the interest bend moved by advertisement valorem charge is contacting the underlying, when the cost is zero and digressing from it when the cost is developing. In any case, in the market harmony the two bends cross.[5]